Rock drilling is widely used in construction, mining, and tunneling. The setting of rock drilling parameters often affects the efficiency and results of rock drilling. In rock drilling, reasonable set rock drilling parameters can improve operational efficiency, extend tool service life, reduce costs, and ensure operational safety.

In practice, the drill rig operator sets the percussion pressure according to the rock and then turns the rotational speed according to the corresponding percussion frequency and bit diameter. When the drilling starts, the propulsion pressure is set so that the rotary is uniform and stable. If the setting result is unsatisfactory, for example, the short service life of shank adapters, the impact pressure should be gradually reduced until the rotation is uniform and stable. Use the method of checking the temperature of the shank adapters and the coupling sleeve to ensure the correct setting of the rock drilling parameters. Immediately after starting drilling, check the temperature of the coupling sleeve, which should be about 40 degrees in the case of water medium flushing and about 60 degrees in the case of air medium slagging.

Problems with drilling are mainly due to the loosening of the coupling sleeve and can occur using any rock drilling parameter. To ensure that the joint is tightened while drilling, the frictional force of the drill bit against the bottom of the hole should be increasing. It is achieved by increasing the thrust, increasing the rotary speed, or changing the rock drill bit.

Therefore, the setting of rock drilling parameters directly affects the interaction between rock drilling tools and rock. In addition to reasonable parameter setting, drilling operation and rig maintenance are also important.

Points for attention in drilling operation and drilling rig maintenance

1. When drilling, the propulsion beam should be firmly against the rock without any movement. If the propeller beam moves during drilling, it will generate bending stress. In extreme cases, it will cause the drill rod to break.

2. It is not allowed to start the impact function of the rock drill before the push beam and drill bit touches the rock.

3. Air drilling of the rock drill will damage the drill bit and cause the connection part to loosen.

4. The hole should be opened in the state of low-impact ground pushing, and it is recommended to turn on the high-punch function after the drilling depth of the drill bit reaches 200mm.

5. Sufficient slag flushing medium should be provided whenever possible. If the slag flushing medium switch is open too late, it may cause the risk of the drill sticking and blocking the slag punching hole of the drill bit.

6. The braze should be closed during drilling operations. The gap between the drill sleeve and the drill rod, the drill sleeve, and the holder should not be too large.

7. Set the impact force according to the specific rock condition. When the rock is soft or easily broken, the impact pressure should be reduced.

8. Replace the shank adapter gasket in time. If the gasket is damaged, the lubricating oil will leak light quickly and quickly damage the drive sleeve and the shank adapter. If the gasket is damaged, it must be replaced immediately.

To sum up, the setting of rock drilling parameters plays a critical role in the rock drilling process, directly affecting the operation efficiency, tool service life, and safety. Through reasonable parameter setting, the effectiveness of rock drilling tools can be brought into full play, thereby realizing efficient and safe rock drilling operations. Therefore, scientific rock drilling parameter setting cannot be ignored and needs to be adjusted and optimized continuously according to the actual situation to achieve the best working effect.